﻿using System.Collections.Generic;
using System.IO;
using System.Reflection;
using System.Windows;
using System.Windows.Navigation;
using System.Xml;
using Microsoft.Phone.Controls;
using Microsoft.Phone.Shell;

namespace Chenglin.WPTelecodeTable
{
    public partial class App : Application
    {
        private static Dictionary<int, string> _charCodeMap;
        private static readonly object _locker = new object();

        public static Dictionary<int, string> CharCodeMap
        {
            get
            {
                if (_charCodeMap == null)
                {
                    lock (_locker)
                    {
                        if (_charCodeMap == null)
                        {
                            _charCodeMap = LoadTelecodeTable();
                        }
                    }
                }

                return _charCodeMap;
            }
        }

        /// <summary>
        /// Provides easy access to the root frame of the Phone Application.
        /// </summary>
        /// <returns>The root frame of the Phone Application.</returns>
        public PhoneApplicationFrame RootFrame { get; private set; }

        /// <summary>
        /// Constructor for the Application object.
        /// </summary>
        public App()
        {
            // Global handler for uncaught exceptions. 
            UnhandledException += Application_UnhandledException;

            // Standard Silverlight initialization
            InitializeComponent();

            // Phone-specific initialization
            InitializePhoneApplication();

            // Show graphics profiling information while debugging.
            if (System.Diagnostics.Debugger.IsAttached)
            {
                // Display the current frame rate counters.
                Application.Current.Host.Settings.EnableFrameRateCounter = true;

                // Disable the application idle detection by setting the UserIdleDetectionMode property of the
                // application's PhoneApplicationService object to Disabled.
                // Caution:- Use this under debug mode only. Application that disables user idle detection will continue to run
                // and consume battery power when the user is not using the phone.
                PhoneApplicationService.Current.UserIdleDetectionMode = IdleDetectionMode.Disabled;
            }
        }

        private static Dictionary<int, string> LoadTelecodeTable()
        {
            var map = new Dictionary<int, string>();
            using (var stream = Assembly.GetExecutingAssembly().GetManifestResourceStream("Chenglin.WPTelecodeTable.Data.TelecodeTable.xml"))
            {
                using (var sr = new StreamReader(stream, true))
                {
                    using (var xr = XmlReader.Create(sr))
                    {
                        while (xr.Read())
                        {
                            if (xr.NodeType == XmlNodeType.Element && xr.Name == "c")
                            {
                                int unicodeVal = int.Parse(xr.GetAttribute("u"));
                                int codeVal = int.Parse(xr.GetAttribute("c"));

                                map.Add(unicodeVal, string.Format("{0:0000}", codeVal));
                            }
                        }
                    }
                }
            }

            return map;
        }

        // Code to execute when the application is launching (eg, from Start)
        // This code will not execute when the application is reactivated
        private void Application_Launching(object sender, LaunchingEventArgs e)
        { }

        // Code to execute when the application is activated (brought to foreground)
        // This code will not execute when the application is first launched
        private void Application_Activated(object sender, ActivatedEventArgs e)
        { }

        // Code to execute when the application is deactivated (sent to background)
        // This code will not execute when the application is closing
        private void Application_Deactivated(object sender, DeactivatedEventArgs e)
        { }

        // Code to execute when the application is closing (eg, user hit Back)
        // This code will not execute when the application is deactivated
        private void Application_Closing(object sender, ClosingEventArgs e)
        { }

        // Code to execute if a navigation fails
        private void RootFrame_NavigationFailed(object sender, NavigationFailedEventArgs e)
        {
            if (System.Diagnostics.Debugger.IsAttached)
            {
                // A navigation has failed; break into the debugger
                System.Diagnostics.Debugger.Break();
            }
        }

        // Code to execute on Unhandled Exceptions
        private void Application_UnhandledException(object sender, ApplicationUnhandledExceptionEventArgs e)
        {
            if (System.Diagnostics.Debugger.IsAttached)
            {
                // An unhandled exception has occurred; break into the debugger
                System.Diagnostics.Debugger.Break();
            }
        }

        #region Phone application initialization

        // Avoid double-initialization
        private bool phoneApplicationInitialized = false;

        // Do not add any additional code to this method
        private void InitializePhoneApplication()
        {
            if (phoneApplicationInitialized)
                return;

            // Create the frame but don't set it as RootVisual yet; this allows the splash
            // screen to remain active until the application is ready to render.
            RootFrame = new PhoneApplicationFrame();
            RootFrame.Navigated += CompleteInitializePhoneApplication;

            // Handle navigation failures
            RootFrame.NavigationFailed += RootFrame_NavigationFailed;

            // Ensure we don't initialize again
            phoneApplicationInitialized = true;
        }

        // Do not add any additional code to this method
        private void CompleteInitializePhoneApplication(object sender, NavigationEventArgs e)
        {
            // Set the root visual to allow the application to render
            if (RootVisual != RootFrame)
                RootVisual = RootFrame;

            // Remove this handler since it is no longer needed
            RootFrame.Navigated -= CompleteInitializePhoneApplication;
        }

        #endregion
    }
}